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根据黄海1977年5月—1981年11月逐月大面盐度调查资料,采用旋转经验正交函数(REOF)、调和分析和延迟相关分析等方法,分析了黄海5层盐度场季节循环时空模态与机制。黄海盐度场季节循环主要有2种时空模态:第一模态是对黄海沿岸河流径流、苏北沿岸水、渤南沿岸水和蒸发量与降水量之差季节变化的响应;第二模态是对黄海暖流高盐度水输送季节变化的响应。第一模态空间分量垂直方向为双层结构;第二模态为单层结构。2种模态季节变化位相自表层传播至底层均需要2个月,同层第二模态季节变化位相滞后第一模态2~3个月。各层2种模态时间分量季节循环时间为准对称型。表层温盐模态之间同步显著负相关,表层以深各层温盐模态之间有1~2个月延迟显著负相关。黄海盐度场季节变化容易受到年际变化影响出现季节变异。
According to the monthly saltwater salinity survey from May 1977 to November 1981 in Huanghai Sea, the rotation empirical orthogonal function (REOF), harmonic analysis and delay correlation analysis were used to analyze the seasonal variations of salinity field in the Yellow Sea Modal and mechanism. The seasonal circulation of the salinity field in the Yellow Sea mainly includes two kinds of spatiotemporal modes: the first one is the response to the seasonal variation of the runoff of the Yellow Sea coast, the water and evaporation along the coast of the North Jiangsu and Bonan coastal areas, and the second mode State is the response to the seasonal change of the high salinity water transport in the Yellow Sea warm current. The first modal space component has a double-layer structure in the vertical direction and the second mode has a single-layer structure. Two kinds of modal seasonal changes in phase from the surface to the bottom of the spread are required 2 months, with the second layer of the same season the seasonal phase lags behind the first mode of 2 to 3 months. The seasonal modal time constants of the two modes in each layer are quasi-symmetrical. There was a significant and negative correlation between surface temperature and salt modes, and there was a significant negative correlation between surface temperature and salt modes in 1 ~ 2 months delay. The seasonal variation of the salinity field in the Yellow Sea is vulnerable to seasonal variations due to interannual variations.